Use Power Reserve

Power Reserve lets you see the time on your Apple Watch while preserving your battery life. In Power Reserve, press the side button to show the current time in a 24-hour format. While your Apple Watch is in Power Reserve, your Apple Watch and iPhone won't communicate, and you can't access other watch features.

Turn on Power Reserve

When your battery charge drops to 10 percent, your Apple Watch alerts you and asks if you want to use Power Reserve. When the battery gets too low, your watch automatically enters Power Reserve, and appears next to the time. Learn how to maximize your battery life and lifespan.